Receiving Error Code on Client

rpc_error.js

// Receiving Error Code on Client

var lastTodoId = 45;

$('#todos li').click(function(e) {
  var $tgt = $(e.target), todoId = $tgt.prop('id');

  TodoManager.deleteTodo(todoId, function(err) {
    if (err.code === 1004) { 
      alert(err.message);
    }
    else {
      $tgt.remove();
    }
  });
});